WO2005104398A1 - Method and apparatus for transmitting input stream of data symbols in multiple-input/multiple-output wireless communications system - Google Patents

Method and apparatus for transmitting input stream of data symbols in multiple-input/multiple-output wireless communications system Download PDF

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Publication number
WO2005104398A1
WO2005104398A1 PCT/JP2005/007665 JP2005007665W WO2005104398A1 WO 2005104398 A1 WO2005104398 A1 WO 2005104398A1 JP 2005007665 W JP2005007665 W JP 2005007665W WO 2005104398 A1 WO2005104398 A1 WO 2005104398A1
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substreams
space
substream
stream
transmit diversity
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PCT/JP2005/007665
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French (fr)
Inventor
Neelesh B. Mehta
Pallav Sudarshan
Andreas F. Molisch
Jinyun Zhang
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Mitsubishi Denki Kabushiki Kaisha
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Priority to EP05734037A priority Critical patent/EP1738486B1/en
Priority to JP2006519694A priority patent/JP4694479B2/en
Publication of WO2005104398A1 publication Critical patent/WO2005104398A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0673—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using feedback from receiving side

Definitions

  • the invention relates generally to wireless communication systems, andmore particularly to selecting antennas in multiple input, multiple output wireless communications systems.
  • MIMO antenna systems are envisaged for deployment in wireless communications systems designed according to future 3G and 4G standards.
  • the multiple antennas will support high data rates and increase capacity and coverage for a cellular telephone systems that provide both high rate and low rate services to multiple users in a fixed bandwidth wireless channel.
  • Multiple antenna systems exploit spatial characteristics of the channel using spatial multiplexing and transmit diversity.
  • Foschini et al . "On Limits of Wireless Communications in a Fading Environment when Using Mul tiple Antennas, " Wireless Pers. Commun., pp, 311-335, 1998.
  • a number of architectures are known that attempt to achieve a theoretical capacity of the channel, Foschini et al . , “Layered Space-Time Archi tecture for Wireless Communication in a Fading Environment When Using Multiple Antennas, " Bell Labs Tech. J., vol.1, no.2, pp.41-59, 1996, Wolniansky et al.
  • V-BLAST An Archi tecture for Realizing Very High Data Rates Over the Rich-Scattering Wireless Channel, " ISSSE, pp. 295-299, 1998 and Sellathurai egt al . , " TURBO-BLAST for Wirel ess Communications : Theory and Experiments, " IEEE Trans. Commun., vol. 50, no. 10, pp. 2538-2546, Oct. 2002.
  • Closed-loop (CL) diversity systems exploit information about the channel at the transmitter, Sandell, "Analyti cal analysi s of transmi t diversi ty in WCDMA on fading mul t ipath channels ' IEEE Int. Symp. on Personal, Indoor and Mobile Radio Commun., 1999.
  • Open-loop (OL) system do not exploit channel information, Tarokh et al., "Space Time Codes for High Data Rate Wireless Communication, "IEEE Trans. Inform. Theory, vol .44, pp.744-765, 1999, and Alamouti, "A simple transmi t diversi ty technique for wireless communications, " IEEE J. SelectedAreas inCommun. , vol. 16, Oct., pp. 1451-1458, 1998.
  • a transmit diversity technique requires two transmit antennas and at least one receive antenna, 3GPP Standard TR 25.211, " Physical Channels and Mapping of Transport Channels onto Physical Channels [FDD) , " v5.4.0, 06/2003.
  • Multiple antenna solutions forhighernumber oftransmit and receive antennas have also been described for 3GPP, " TR25. 869 : Transmi tter diversi ty sol utions for mul tiple antennas, " vl.2.0, Sep. 2003, and " TR 25. 876: Mul tiple Input Mul tiple Output (MIMO) Antennae in UTRA, " vl.3.0, Feb. 2004.
  • MIMO Mul tiple Input Mul tiple Output
  • UE user equipment
  • UE user equipment
  • UE user equipment
  • Schemes based on STTD for example, double space time transmit diversitywith subgroup rate control, (DSTTD-SGRC) , as described in U.S. Patent Application Sn. 10/209,306, "MIMO Systems wi th Rate Feedback and Space Time Transmit Diversi ty, " filed by Horng et al . , on July 31 st , 2002, require that the number of receive antennas is only half the number of transmit antennas for proper decoding of the transmitted signal.
  • DTTD-SGRC subgroup rate control
  • V-BLAST and other similar techniques require at least as many receive antennas as transmit antennas. For example, for four transmit antennas, DSTTD-SGRC requires two antennas while V-BLAST requires four receive antennas, while MRT requires one receive antenna.
  • a method transmits an input stream of data symbols in a multiple-input, multiple-outputwireless communications system.
  • the input stream is demultiplexed into M substreams.
  • Each of the M substreams is adaptively modulated and coded to a coded substream according to channel conditions.
  • a first of the Mcoded substreams is space-time transmit diversity encoded into two space-time transmit diversity encoded substreams . There is one space-time transmit diversity encoded substream for each one of two transmit antennas. Each other coded substream is transmitted directly by a corresponding one of remaining M-l transmit antennas.
  • FIG. 1 is a block diagram of a transmitter according to the invention.
  • FIG. 2 is a block diagram of a transmitter according to an alternative embodiment of the invention.
  • the invention provides a transmitter that is backward compatible with transmitters that use space-time transmit diversity (STTD) coding to increase a diversity order of a spatial channel.
  • STTD space-time transmit diversity
  • the transmitter transmits multiple independent data streams concurrently, and requires fewer receive antennas than transmit antennas.
  • Adaptive modulation and coding (AMC) is applied to each of the independent data streams to match different channel conditions with required performance, and to achieve a higher system capacity.
  • FIG. 1 shows a transmitter 100 for a multiple-input, multiple-out (MIMO) wireless communications systems according to the invention.
  • the transmitter 100 includes M+l transmit antennas.
  • a first pair of antennas is labeled 140, and the remaining M-l single antennas are labeled 145.
  • a data stream X 101 is provided to a combined stream selection switch and demultiplexer (de ux) 110.
  • the demultiplexer 110 partitions the stream 101 into, at most, M substreams 111-113.
  • a first substream is fed to the first pair of antennas 140, and each of the remaining M-l substreams are fed directly to the corresponding one of the remaining M-l single antennas 145.
  • some of the M+l antennas can be turned off or deselected by switches (SW) 102. These are called ⁇ inactive' antennas.
  • SW switches
  • the remaining ⁇ active' antennas transmit the substreams withparticular coding rates and modulation based on the channel condition 160 as determined by a rate and modulation selection block 150.
  • deselecting some of the antennas means that the demultiplexer produces a fewer number of substreams.
  • the first substream 111 is to be transmitted by the two transmit antennas 140, via a STTD encoder 130.
  • Each of the remaining substreams 112-113 is to be transmitted by a corresponding one of the single antennas 145.
  • the STTD encoder 130 takes in information symbols X ⁇ and X ⁇ 2 of the first stream 111, and outputs two pairs of symbols 131 as:
  • each row (pair) represents the output to a specific one of the two transmit antennas 140.
  • the other active substreams take the two information symbols Xn and X ⁇ 2 and transmit the symbols directly as x x n j where i is the substream number.
  • the output of the STTD block 130 is further demultiplexed into Nstreams , where N is the number of orthogonal variable spreading factor (OVSF) codes assigned.
  • N is the number of orthogonal variable spreading factor (OVSF) codes assigned.
  • OVSF orthogonal variable spreading factor
  • Each stream is spread with its respective OVSF code (OC) and then scrambled with a corresponding scrambling code (SC) .
  • SC scrambling code
  • the number of transmit antennas is (M+l) .
  • the receiver has at least antennas. This is summarized in Table A.
  • the transmitter according to the invention provides a middle groundbetween D-STTD andV-BLAST-based transmitter structures .
  • Figure 2 shows an alternative embodiment.
  • the first two substreams are fed to corresponding pairs of transmit antennas.
  • the transmitter 200 includes M+2 transmit antennas.
  • the first two pairs of antennas are labeled 140, and the remaining M-2 single antennas are labeled 145.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method transmits an input stream of data symbols in a multiple-input, multiple-output wireless communications system. The input stream is demultiplexed into M substreams. Each of the M substreams is adaptively modulated and coded to a coded substream according to channel conditions. A first of the M coded substreams is space-time transmit diversity encoding into two space-time transmit diversity encoded substreams. There is one space-time transmit diversity encoded substream for each one of two transmit antennas. Each other coded substream is transmitted directly by a corresponding one of remaining M-1 transmit antenna.

Description

DESCRIPTION
Method and Apparatus for Transmitting Input Stream of Data Symbols in Multiple-Input/Multiple-Output Wireless Communications System
Technical Field
The invention relates generally to wireless communication systems, andmore particularly to selecting antennas in multiple input, multiple output wireless communications systems.
Background Art
Multiple-input, multiple-out (MIMO) antenna systems are envisaged for deployment in wireless communications systems designed according to future 3G and 4G standards. The multiple antennas will support high data rates and increase capacity and coverage for a cellular telephone systems that provide both high rate and low rate services to multiple users in a fixed bandwidth wireless channel. Multiple antenna systems exploit spatial characteristics of the channel using spatial multiplexing and transmit diversity.
In spatial multiplexing, multiple data streams are transmitted concurrently from multiple antennas and received by multiple antennas, Foschini et al . , "On Limits of Wireless Communications in a Fading Environment when Using Mul tiple Antennas, " Wireless Pers. Commun., pp, 311-335, 1998. A number of architectures are known that attempt to achieve a theoretical capacity of the channel, Foschini et al . , "Layered Space-Time Archi tecture for Wireless Communication in a Fading Environment When Using Multiple Antennas, " Bell Labs Tech. J., vol.1, no.2, pp.41-59, 1996, Wolniansky et al. , "V-BLAST: An Archi tecture for Realizing Very High Data Rates Over the Rich-Scattering Wireless Channel, " ISSSE, pp. 295-299, 1998 and Sellathurai egt al . , " TURBO-BLAST for Wirel ess Communications : Theory and Experiments, " IEEE Trans. Commun., vol. 50, no. 10, pp. 2538-2546, Oct. 2002.
In transmit diversity, the same data stream is transmitted over multiple transmit antennas to increase a diversity order of the signal at the receiver, Anderson, λλAntenna Arrays in Mobile Communicati ons : Gain, diversi ty and channel capaci ty, " IEEE Antennas Propagat. Mag., vol. 42, pp. 12-16, Apr. 2000.
Closed-loop (CL) diversity systems exploit information about the channel at the transmitter, Sandell, "Analyti cal analysi s of transmi t diversi ty in WCDMA on fading mul t ipath channels ' IEEE Int. Symp. on Personal, Indoor and Mobile Radio Commun., 1999. Open-loop (OL) system do not exploit channel information, Tarokh et al., "Space Time Codes for High Data Rate Wireless Communication, "IEEE Trans. Inform. Theory, vol .44, pp.744-765, 1999, and Alamouti, "A simple transmi t diversi ty technique for wireless communications, " IEEE J. SelectedAreas inCommun. , vol. 16, Oct., pp. 1451-1458, 1998.
With space time transmit diversity (STTD) , a transmit diversity technique requires two transmit antennas and at least one receive antenna, 3GPP Standard TR 25.211, " Physical Channels and Mapping of Transport Channels onto Physical Channels [FDD) , " v5.4.0, 06/2003. Multiple antenna solutions forhighernumber oftransmit and receive antennas have also been described for 3GPP, " TR25. 869 : Transmi tter diversi ty sol utions for mul tiple antennas, " vl.2.0, Sep. 2003,, and " TR 25. 876: Mul tiple Input Mul tiple Output (MIMO) Antennae in UTRA, " vl.3.0, Feb. 2004.
While spatial multiplexing provides higher data rates and increases the spectral efficiency of wireless links, transmit and receive diversity make single stream transmission more reliable in time-varying wireless channels. Thereby, the range and area of acceptable coverage is increased. There exists a fundamental trade-off between achievable diversity and spatial multiplexing gains, Zheng and Tse, "Di versi ty and Mul tiplexing: A Fundamental Tradeoff in Mul tiple-Antenna Channels, " IEEE Transactions on Information Theory, Vol. 49, No. 5, pp. 1073-1096, May 2003.
Another issues is the number of antenna elements that user equipment (UE), e.g., a small, hand-held, cellular telephone can accommodate. Schemes based on STTD, for example, double space time transmit diversitywith subgroup rate control, (DSTTD-SGRC) , as described in U.S. Patent Application Sn. 10/209,306, "MIMO Systems wi th Rate Feedback and Space Time Transmit Diversi ty, " filed by Horng et al . , on July 31st, 2002, require that the number of receive antennas is only half the number of transmit antennas for proper decoding of the transmitted signal.
Pure transmit diversity techniques, such as maximum ratio transmission (MRT) , do not place any minimum requirements on the number of receive antennas. V-BLAST and other similar techniques require at least as many receive antennas as transmit antennas. For example, for four transmit antennas, DSTTD-SGRC requires two antennas while V-BLAST requires four receive antennas, while MRT requires one receive antenna.
Disclosure of Invention
A method transmits an input stream of data symbols in a multiple-input, multiple-outputwireless communications system. The input stream is demultiplexed into M substreams.
Each of the M substreams is adaptively modulated and coded to a coded substream according to channel conditions. A first of the Mcoded substreams is space-time transmit diversity encoded into two space-time transmit diversity encoded substreams . There is one space-time transmit diversity encoded substream for each one of two transmit antennas. Each other coded substream is transmitted directly by a corresponding one of remaining M-l transmit antennas.
Brief Description of Drawings
Figure 1 is a block diagram of a transmitter according to the invention; and
Figure 2 is a block diagram of a transmitter according to an alternative embodiment of the invention.
Best Mode for Carrying Out the Invention
The inventionprovides a transmitter that is backward compatible with transmitters that use space-time transmit diversity (STTD) coding to increase a diversity order of a spatial channel. The transmitter transmits multiple independent data streams concurrently, and requires fewer receive antennas than transmit antennas. Adaptive modulation and coding (AMC) is applied to each of the independent data streams to match different channel conditions with required performance, and to achieve a higher system capacity.
Figure 1 shows a transmitter 100 for a multiple-input, multiple-out (MIMO) wireless communications systems according to the invention. The transmitter 100 includes M+l transmit antennas. A first pair of antennas is labeled 140, and the remaining M-l single antennas are labeled 145.
A data stream X 101 is provided to a combined stream selection switch and demultiplexer (de ux) 110. The demultiplexer 110 partitions the stream 101 into, at most, M substreams 111-113. A first substream is fed to the first pair of antennas 140, and each of the remaining M-l substreams are fed directly to the corresponding one of the remaining M-l single antennas 145.
Depending on a channel condition 160 feedback from a receiver 500, or other constraints such as backward compatibility, some of the M+l antennas can be turned off or deselected by switches (SW) 102. These are called ^inactive' antennas. The remaining ^ active' antennas transmit the substreams withparticular coding rates and modulation based on the channel condition 160 as determined by a rate and modulation selection block 150. For further details see the related application. Of course deselecting some of the antennas means that the demultiplexer produces a fewer number of substreams.
The first substream 111 is to be transmitted by the two transmit antennas 140, via a STTD encoder 130. Each of the remaining substreams 112-113 is to be transmitted by a corresponding one of the single antennas 145.
During the duration of two symbols, the STTD encoder 130 takes in information symbols Xπ and Xι2 of the first stream 111, and outputs two pairs of symbols 131 as:
Figure imgf000009_0001
where * denotes a complex conjugate, and each row (pair) represents the output to a specific one of the two transmit antennas 140.
The other active substreams take the two information symbols Xn and X±2 and transmit the symbols directly as x xn j where i is the substream number.
Spreading and Scrambling
In WCDMA systems, the output of the STTD block 130 is further demultiplexed into Nstreams , where N is the number of orthogonal variable spreading factor (OVSF) codes assigned. Each stream is spread with its respective OVSF code (OC) and then scrambled with a corresponding scrambling code (SC) . The scrambled streams are then combined and transmitted from one or two antennas, depending on whether the stream uses STTD or not. For further details see the related application.
Receiver Structure The number of transmit antennas is (M+l) . To uniquely decode the input data stream 101, the receiver has at least antennas. This is summarized in Table A.
Table A
Figure imgf000010_0001
The transmitter according to the invention provides a middle groundbetween D-STTD andV-BLAST-based transmitter structures .
Figure 2 shows an alternative embodiment. In this transmitter, the first two substreams are fed to corresponding pairs of transmit antennas. In this case forMsubstreams, the transmitter 200 includes M+2 transmit antennas. The first two pairs of antennas are labeled 140, and the remaining M-2 single antennas are labeled 145.
It is to be understood that various other adaptations and modifications may be made within the spirit and scope of the invention. Therefore, it is the object of the appended claims to cover all such variations and modifications as come within the true spirit and scope of the invention.

Claims

1. A method for transmitting an input stream of data symbols in a multiple-input/multiple-output wireless communications system, comprising: demultiplexing the input stream into M substreams; adaptivelymodulating andcoding eachof theMsubstrea s to a coded substream; space-time transmit diversity encoding a first of the Mcodedsubstreams into two space-time transmit diversityencoded substreams, one space-time transmit diversity encoded substream to be transmittedby a corresponding one of two transmit antenna; and transmitting directly each other coded substream by a corresponding single transmit antenna.
2. The method of claim 1 further comprising: feeding back, from a receiver, channel conditions of an associated channel for each transmit antenna; and selecting a maximum data rate and a modulation for each substream based on the channel conditions.
3. The method of claim 2, in which the channel conditions measure a signal to interference plus noise ratio of the output streams received in the receiver.
4. The method of claim 1, in which the adaptive modulating and coding, further comprises: coding each substream; interleaving each coded substream; and symbol mapping each interleaved substream.
5. The method of claim 1, further comprising: demultiplexing each output stream into a plurality demultiplexed output streams; multiplying each of the plurality of demultiplexed output streams by an orthogonal variable spreading factor; adding the demultiplexed output streams, for each ouput stream, after multiplication into a summed output stream corresponding to each output stream; and multiplying each summed output stream by a scrambling code .
6. The method of claim 1, further comprising: space-time transmit diversity encoding each of a subset of the Mcoded substreams into two space-time transmit diversity encoded substreams, one space-time transmit diversity encoded substreamto be transmittedby a corresponding one of two transmit antenna; and transmittingdirectlyeachother of theMcodedsubstream not included in the subset by a corresponding single transmit antenna.
7. The method of claim 2, further comprising: selecting the numberMof substreams based on the channel condition.
8. An apparatus for transmitting an input stream of data symbols in a multiple-input/multiple-output wireless communications system, comprising: M+l transmit antennas; a demultiplexer configured to demultiplex the input stream into M substreams; M means for adaptively modulating and coding each of the M substreams to a coded substream; means for space-time transmit diversity encoding a first of the Mcoded substreams into two space-time transmit diversity encoded substreams, one space-time transmit diversity encoded substreamto be transmittedby a corresponding one of two transmit antenna; and means for transmitting directly each other M-l coded substream by a corresponding single transmit antenna.
PCT/JP2005/007665 2004-04-21 2005-04-15 Method and apparatus for transmitting input stream of data symbols in multiple-input/multiple-output wireless communications system WO2005104398A1 (en)

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EP05734037A EP1738486B1 (en) 2004-04-21 2005-04-15 Method and apparatus for transmitting input stream of data symbols in multiple-input/multiple-output wireless communications system
JP2006519694A JP4694479B2 (en) 2004-04-21 2005-04-15 Method and apparatus for transmitting an input stream of data symbols in a multiple input / multiple output wireless communication system

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US10/828,625 2004-04-21
US10/828,625 US7020446B2 (en) 2002-07-31 2004-04-21 Multiple antennas at transmitters and receivers to achieving higher diversity and data rates in MIMO systems

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